Improvement in blowing-machines



T. A. COCHRANEY & J. HENDY.

BLOWING-MACHINE.

Patented May 15, 1877.

itnesse Inventor N.PETER5. PHOTQ-LITHOGRAPHER, WASHINGTON D C UNITEDSTATES PATENT QFFICE.

THOMAS A. OOOHRANE AND JOSHUA HENDY, OF SAN FRANCISCO, GAL.

IMPROVEMENT IN BLOWING-MACHINES.

Specification forming part of Letters Patent No. H90,828, dated May 15,1877 application filed March .23, 1877.

To all whom it may concern:

Beit known that we, THOMAS A.COOHRANE and JOSHUA HENDY, of the city andcounty of San Francisco and State of California, have inventedImprovements in Blowing-Machines; and we do hereby declare the followingto be a full, clear, and exact description thereof, reference being hadto the accompanying drawings.

Our invention relates to certain improvements in that class ofblowing-machines in which one or more radial vanes are secured to acylinder or axial shaft inside of a cylindrical case or shell, and inwhich a rotary abutment is used for closing communication between theair inlet and exhaust passages, said rotary abutment being provided witha longitudinal recess, in which the vanes are received and passed fromone side of the machine to the other.

In blowing-machines of this class the rotary abutment is operated by agear-connection with the main shaft in such a manner that the outer endsof the vanes will successively enter therecess in the abutment at theproper instan t, while the rotation of both will allow the vanes to passfrom one side of the machine to the other, and at the same time preservea sufficiently air-tight joint between them.

Heretofore the vanes have each been made in a single piece, which wouldnot yield to any irregularity of the synchronal movement. The machiuewastherefore liable to be broken or rendered useless by the natural wearupon its parts. I

This difficulty we remedy by constructing the vanes in two parts andhinging them together, so as to allow them to yield to any irregularityof motion. We also provide other improvements, all of which are fullyset forth in the following specification.

Referring to the accompanying drawings, let A represent the cylindricalshell or case, inside of which the axial small cylinder B, which carriesthe vanes, is rotated.

D is the semi-cylindrical chamber, inside of which the rotary abutment His placed. In our improved blower we place this rotary abutment in thelower part of the case or shell. E is the inlet, and F the exhaust portsor passages.

Each of the vanes we make in two parts, consisting of a rigid and fixedportion, 0, and a hinged portion, g. The rigid portion is formed upon orattached to the cylinder, while the hinged portion is secured by hingesto the outer edge of the fixed portion. The relative width of eitherpart is immaterial.

The hinges are so constructed that the outer portion of the vanes canclose only on the side toward which the vane is moving, While a shoulderprevents it from passing the radial line in the opposite direction.

Usually the centrifugal force which is generated by the rotation of thecylinder will be sufliicient to keep the hinged portion thrown out toits radial position; but in order to insure this position we secure oneend of a flat spring, 2', to the fixed portion of the vane, so that itwill extend partially across the hinged portion, and thus keep it in itsopen position. The presence of the air in front of the vane also aids inkeeping it open, so that its edge will move close to the inner wall ofthe case or shell.

The abutment H makes two rotations while the cylinder makes but one ittherefore travels twice as fast as either of the vanes, so that when theouter edge of one of the vanes enters the recess in the abutment thesuperior speed of the abutment will carry it forward, and thus preservea tight joint, at the same time that the vane yields or adjusts itselfto any irregularity of motion.

This arrangement allows for a considerable variation in the synchronalaction of the abut ment and cylinder, so that the machine will last muchlonger, with but little chance for accident.

To prevent the recess in the abutment-cylinder from carrying air aroundwith it, we make a hole, 0, in the end of the semicylindrical case, inwhich the abutment rotates, in such a position that after the recessstops itself from the main cylinder the air contained in it will bereleased through the hole.

We thus render this class of blowingmachines much more .durable andreliable than heretofore.

Having thus described our invention, what we claim, and desire to secureby Letters Patcut, is-

1. The cylinder B of a rotary pressureblower, provided with flexible orhinged vanes c g, in combination with the rotary recessed abutment H,the whole mounted in a single shell or case, A E, substantially as andfor the purpose described.

2. Theeoinbination, with the rotary recessed abutment H, of thecylindrical shell A, provided with opening 0, substantially as and forthe purpose specified.

In witness whereof we have hereunto set our hands and seals.

T. A. OOGHRANE. 1.. 8.] JOSHUA HENDY. |L.S.]

Witnesses:

GEo. H. STRONG, OLWYN T. STACY.

